Nus pyke



(No Model.)

L. S. M. PYKE & E. S. HARRIS.

ELECTRICAL INDUOTORIUM. No. 484,544. Patented Oct. 18, 1892.

FIG-l.

"UNITED STATES PATENT OFFICE.

-LAZARUS SIMON MAGNUS PYKE AND EDW'ARD STEPHEN HARRIS, OF

LONDON, ENGLAND.

ELECTRICAL lNDUCTORlUIVI.

SPECIFICATION forming part of Letters Patent No. 484,544, dated October 18, 1892.

Application filed February 5, 1892. Serial No. 420.471- (No model.)

To Ml whom, it may concern:

Be it known that we, LAZARUS SIMON MAG- NUs PYKE and EDWARD STEPHEN HARRIS, electrical engineers and contractors, subjects of the Queen of Great Britain, both residing at 34: New Tothill Street, WVestminster, London, England, have invented certain new and useful Improvements in Electrical Inductoria, of which the following is a specification.

This invention relates to electrical inductoriat'. 6., transformersin which a liquid hydrocarbon is employed for insulation and reduction of temperature, as described in another application for Letters Patent of even date herewith filed by the said Lazarus Simon Magnus Pyke and Harry Theodore Barnett, Serial No. 420,441, filed February 5, 1892.

The objects of the present invention are mainly to simplify the construction and improve the insulation and cooling of the inductorium and reduce the volume of the insulating liquid required.

The improvementin the construction of the inductorium or transformer consists, essentially, first, in the combination, with the coils, of a closed magnetic circuit formed of radial laminae of U shape embracing the coils on the inner and outer circumference and at one end, and alternate laminae embracing opposite ends of the coil and overlapping each other, as hereinafter described; second, in the combination, with the coil thus constructed and mounted in a vertical position, of a containing-vessel and a mass of insulating liquid permeating and surrounding the coil and rising to such a height above the same that an internal circulation of the liquid will be set up through the coil by the change of temperature of the liquid, whereby the heat developed by the coil will be continually carried off and dispersed; third,in the construction of the said vessel of annular section, so as to expose an internal radiating surface for the dispersion of heat, and with its outer circumference vertically corrugated, so as to augment the heat-radiatin g surface, and at same time provide a means of holding the laminae securely in position during transport and insure regularity of the spacing between groups of the same necessary for the regular and efficient circulation of the liquid.

Reference is to be had to the accompanying drawings, wherei n Figure 1 is a vertical sectional elevation of the transformer; and Fig. 2, ahalf-plan of the same, in section, in line 11, Fig. 1.

The same letters of reference indicate the same parts in both the figures.

A is the annular containing and cooling vessel, made, preferably of earthenware, corrugated on the outer circumference (and which may be provided, also, with external gills) to increase theheat-radiatiug surface. The said vessel is annular in cross-section and closed at top by an annular cover A, made to close airtight bya packing of rubber a and secured by a screw-bolt B, passing axially through the vessel and bridges C C, respectively, bearing on the cover A and on the bottom of the vessel A.

D is the coil composed of the usual primary and secondary wires d d, the former preferably wouud with silk or cotton and the latter doubly wound with cotton. The primary is separated from the secondary wire and both from the lamina; by layers 6 E of porous paper-linen or other mechanically-insulating material permeable bythe liquid hydrocarbon.

F are the upper and lower series of radial laminae composing the closed magnetic circuit of the coil, each being a soft-iron plate of the U form shown in Fig. 1, so as to inclose on three sides a radial section of the coil. They are applied alternately at opposite ends of the coil D, so that the arms of one series shall alternate with and overlap the arms of the other, as shown in Fig. 1, and any suitable number of these overlapping laminae may be bolted together in a group by boltsf of non-magnetic metal, so as to mutually hold each other in place on the coil and enable the transformer to be handled without falling to pieces. The laminae are separated by similarly-shaped pieces of porous paper interleaved between them. This alternate and overlapping arrangement of U-shaped plates admits of the transformer being very quickly put together. The transformer thus constructed should stand in a vertical position, so that the insulating liquid may circulate freely and uniformly between all of the laminze, in order to prevent local heating, the vessel A being about twice the height of the coil, so as to contain sufficient liquid for circulation by convection currents set up in its mass and expose sufficient cooling-surface. W'ith the latter object it is made annular to permit the circulation of air through it. In order to preserve the spacing of the groups of laminae during transport, each group of plates F fits into a corresponding corrugation of the containingvessel A, as shown in Fig 2. The coilisheld down in place by a Wood ringGand distancepieces g, fastened thereto and abutting against the cover A. The insulating liquid with which the vessel A is completely filled may be heavy petroleurn free from all volatile distillates and thoroughly dehydrated, for which purpose a bag of powdered potassium or so- LAZARUS SIilION MAGNUS IYKE. EDWARD STEPHEN HARRIS.

Witnesses:

G. F. WARREN,

Notary Public, London. JOSEPH LAKE,

17 Gracechurch Street, London, E. C. 

